Temperature measurement and heat flux characterization in grinding using thermography

Brosse, Alexandre; Naisson, Pierre; Hamdi, Hédi; Bergheau, Jean‐Michel

doi:10.1016/j.jmatprotec.2007.11.267

Cited by 66 publications

(42 citation statements)

References 9 publications

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“…The method was tested on ideal data where the errors were below 2%. In case of real measurement data, an image of workpiece after treatment resulting from thermography [1] was used. It was shown in the experimental data, that even with very high errors the method is able to provide reasonable results.…”

Section: Resultsmentioning

confidence: 99%

“…It was shown in the experimental data, that even with very high errors the method is able to provide reasonable results. Moreover it was shown that the common triangular shape of heat flux [2] or polynomial of second order [1] are not accurate enough to represent the shape of entering heat flux at the surface of workpiece during the grinding process based on the data which were used. This method has recovered also the flux directions with one free additive parameter.…”

Section: Resultsmentioning

confidence: 99%

“…In this example are two types of errors. The first is due to numerical integration of Planck's law used in [1] and second is due to manual picking up data (section: data description). There was 105 picked data and 400 elements used for the reconstruction.…”

Section: Experimental Data 2 -Real Data (Grinding)mentioning

confidence: 99%

“…In order to avoid that damage, many analytical solutions and numerical simulations were provided with different approaches to obtaining the heat flux shape [1,2]. The current assumption of heat flux entering the workpiece is triangular [2] or polynomial (Q=a+bx+cx 2 ) [1].…”

Section: Introductionmentioning

confidence: 99%

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Heat flux reconstruction in the grinding process from temperature data

Irša¹,

Galybin²

2009

WIT Transactions on Modelling and Simulation

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The problem considered in this paper deals with reconstruction of heat flux from temperature measurements, where due to lack of data, numerical integration is impossible. The problem is reduced to the determination of unknown complex coefficients of a linear piecewise holomorphic function representing heat flux properties and a quadratic holomorphic function representing complex temperature distribution. This leads to an over-determined system of linear algebraic equations, which are subjected to experimental errors. The reconstruction of heat flux is unique; however, reconstruction of flux directions is non-unique. It contains one free additive parameter. The method is useful in situations where limited data on temperature are provided.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Data 2 -Real Data (Grinding)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat flux reconstruction in the grinding process from temperature data

Irša¹,

Galybin²

2009

WIT Transactions on Modelling and Simulation

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“…In the opposite case, a large number of individual grit sources must be considered. If the thermal load is approximated by a continuous heat source moving at the workpiece velocity, the accurate determination of the heat partition ratio and the thermal balance requires the knowledge of the temperature close to the grinding zone (by thermocouple [1][2][3]8,9], optical fiber [10] or thermography method [11,12]), the actual contact length between the wheel and the workpiece [13], the shape of the heat source (uniform, right angled triangle, scalene triangle [9], parabolic [11]), the effect of contact angle for deep grinding [12,14], the convective heat transfer to the coolant [2,9] and the quantity of heat carried away in the chips. The contact angle is neglected in shallow grinding leading to the assumption of a heat source moving in the plane of the ground surface.…”

Section: Introductionmentioning

confidence: 99%

Measurement of grinding temperatures using a foil/workpiece thermocouple

Lefebvre

Lanzetta

Lipiński

et al. 2012

International Journal of Machine Tools and Manufacture

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The high temperature generated in abrasive processes is the main factor responsible for thermal damage to a ground surface. It can be predicted through the thermal balance of the heat fluxes in the process. Such predictions can be experimentally verified using a foil/workpiece thermocouple. To estimate the thermal behaviour of such a sensor, it was dynamically calibrated with a laser beam to measure its frequency response. It was found that the response of the sensor has a time constant dependant on the thermal load and cannot be modelled by a simple first order function. In the calibration conditions used, the sensor is fast enough to measure the surface temperature with a time constant less than 100 microseconds.A high frequency acquisition system allows the signal to be measured at the local grit scale so that the activity of grits and the contact stability between the foil and the workpiece during grinding can be studied. By using the peak temperature and the local cooling after a peak, suitably processed, a local background temperature can be defined. It is shown that this background temperature can be evaluated more accurately by matching the global cooling curve to a finite element solution. The temperatures obtained from the local minima of the local diffusive cooling curve agree better with measured results than a temperature obtained by low pass filtering, which can overestimate the background temperature and so the partition ratio.Keywords: grinding; temperature; thermocouple; dynamic calibration; heat transfer; signal processing Measurement of grinding temperatures using a foil/workpiece thermocouple AbstractThe high temperature generated in abrasive processes is the main factor responsible for thermal damage to a ground surface. It can be predicted through the thermal balance of the heat fluxes in the process. Such predictions can be experimentally verified using a foil/workpiece thermocouple. To estimate the thermal behaviour of such a sensor, it was dynamically calibrated with a laser beam to measure its frequency response. It was found that the response of the sensor has a time constant dependant on the thermal load and cannot be modelled by a simple first order function. In the calibration conditions used, the sensor is fast enough to measure the surface temperature with a time constant less than 100 microseconds.A high frequency acquisition system allows the signal to be measured at the local grit scale so that the activity of grits and the contact stability between the foil and the workpiece during grinding can be studied. By using the peak temperature and the local cooling after a peak, suitably processed, a local background temperature can be defined. It is shown that this background temperature can be evaluated more accurately by matching the global cooling curve to a finite element solution. The temperatures obtained from the local minima of the local diffusive cooling curve agree better with measured results than a temperature obtained by low pass filtering, which can overestimate...

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